whats the probability for getting heads on all 4 coins ?
may i know why do you think it is 1/2
its a 50/50 chance to land on head.
its a 50/50 chance to land head on one coin
but when you have four coins, the probability for landing heads on "ALL" four coins need not be 1/2 right
the probability is actually 1/2*1/2*1/2*1/2 = 1/16
so what like 1/4?
oh sorry. 4 coins. my bad
Yes, another question whats the probability for getting NOT getting heads in any of the four coins ?
1/2 each so total would be another 1/16?
Yep! so P(X=0) is 1/16 and P(X=4) is also 1/16
Now, whats the probability of getting exactly ONE head ?
P(X=1) = ?
I would think 1/2 but i know thats not it
one way to get exactly ONE head is : H T T T
notice that there are 3 other ways to get exactly ONE head : T H T T T T H T T T T H
so the probability for getting exactly ONE head is 4/16 = 1/4
see if that makes sense
Yes it does, I see what you mean now. okay.
look at the options
Yes! our work so far matches perfectly with option A
Yes thats why I said A, the work matches A and not others